STERO SG, Service And Parts Manual

Page: 32 / 93

SUMP HEATER TEST
Certain procedures in
this section require electrical test or
measurements while power is applied
to the machine. Exercise extreme
caution at all times and follow Arc Flash
procedures. If test points are not easily
accessible, disconnect power and
follow Lockout/Tagout procedures,
attach test equipment and reapply
power to test.
NOTE: This test is to test the heating element. It is
NOT a test for machine calling for heat.
NOTE: Tank must be filled with water (pressure
switch closed) in order to test tank heat circuit.
1. Remove LEFT AND RIGHT TRIM PANELS.
2. Apply power to machine and turn machine on.
3. Verify voltage at element; verify it matches
machine specifications on data plate, when
calling for heat.
4. With voltage supplied and verified, take amp
probe to one lead wire of element and verify
current (amps) specifications per SUMP
HEATER TEST SPECIFICATIONS.
5. If current (amps) is incorrect or does not match
specifications on data plate, replace heating
element.
SUMP HEATER TEST SPECIFICATIONS
VOLTAGE CURRENT RESISTANCE
120 V 10.1 - 11.8 Amps 9.6 - 11.2
Ω
208 V 5.9 - 6.8 Amps 28.9 - 33.5
Ω
240 V 6.8 - 7.9 Amps 28.9 - 33.5
Ω
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Resistance Test on Heating Element
1. Remove LEFT AND RIGHT TRIM PANELS.
2. Disconnect lead wires to heater.
3. Test the heater for resistance and compare
meter reading to SUMP HEATER TEST
SPECIFICATIONS.
BOOSTER HEATER TEST
Certain procedures in
this section require electrical test or
measurements while power is applied
to the machine. Exercise extreme
caution at all times and follow Arc Flash
procedures. If test points are not easily
accessible, disconnect power and
follow Lockout/Tagout procedures,
attach test equipment and reapply
power to test.
NOTE: This test is to test the booster heating element.
It is NOT a test for machine calling for heat.
NOTE: Tank must be filled with water (pressure
switch closed) in order to test tank heat circuit.
1. Remove LEFT AND RIGHT TRIM PANELS.
2. Apply power to machine and turn machine on.
3. Verify tank heat contactor is energized.
4. Take voltage reading across all legs of booster
heating element.
5. Verify voltage at element; verify it matches
machine specifications on data plate, when
calling for heat.
6. With voltage supplied and verified, take amp
probe to one lead wire of element and verify
current (amps) specifications per BOOSTER
HEATER TEST SPECIFICATIONS.
7. If current (amps) is incorrect or does not match
specifications on data plate, replace booster
heating element.
BOOSTER HEATER TEST SPECIFICATIONS
SUPPLY
VOLTAGE
CURRENT RESISTANCE
208/60/1 16.0 - 18.7 Amps 10.6 - 12.3
Ω
240/60/1 18.5 - 21.6 Amps 10.6 - 12.3
Ω
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Resistance Test on Booster Heating Element.
1. Remove LEFT AND RIGHT TRIM PANELS.
2. Disconnect lead wires to heater.
SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS
F45577 (1215) Page 32 of 59